^ab"Learn about Y-DNA Haplogroup Q" (Verbal tutorial possible). Genebase Systems. 2008. http://www.genebase.com/tutorial/item.php?tuId=16. Erişim tarihi: 2009-11-21. "Haplogroups are defined by unique mutation events such as single nucleotide polymorphisms, or SNPs. These SNPs mark the branch of a haplogroup, and indicate that all descendents of that haplogroup at one time shared a common ancestor. The Y-DNA SNP mutations were passed from father to son over thousands of years. Over time, additional SNPs occur within a haplogroup, leading to new lineages. These new lineages are considered subclades of the haplogroup. Each time a new mutation occurs, there is a new branch in the haplogroup, and therefore a new subclade. Haplogroup Q, possibly the youngest of the 20 Y-chromosome haplogroups, originated with the SNP mutation M242 in a man from Haplogroup P that likely lived in Siberia approximately 15,000 to 20,000 years before present"

^"mtDNA Variation among Greenland Eskimos. The Edge of the Beringian Expansion". Laboratory of Biological Anthropology, Institute of Forensic Medicine, University of Copenhagen, Copenhagen, McDonald Institute for Archaeological Research,University of Cambridge, Cambridge, University of Hamburg, Hamburg. 2000. http://www.cell.com/AJHG/abstract/S0002-9297%2807%2963257-1. Erişim tarihi: 2009-11-22. "The relatively lower coalescence time of the entire haplogroup A2 including the shared sub-arctic branches A2b (Siberians and Inuit) and A2a (Eskimos and Na-Dené) is probably due to secondary expansions of haplogroup A2 from the Beringia area, which would have averaged the overall internal variation of haplogroup A2 in North America."